Building material.



K. E. BECKER & J. L. KNAPP. BUILDING MATERIAL APPLICATION FILED 001'. 31, 1911.

1,048,4184h Patented Dec.31,1912.

wfvmwwo I Karl E. Becker.

KARL E. BECKER AND JOHN L. KNAPP, 01 DENVER, COLORADO.

BUILDING MATERIAL.

Specification of Letters Patent:

Patented Dec. 31, 1 912.

Application filed .October 31, 1811. Serial No. 657,757.

To all whom it may concern:

Be itknown that we, limo. E. Brenna and JOHN L. ,KNArr, citizens of the United States, residing in the city and county of Denver and State of Colorado have invented certain new and useful Improvements in Building Material; and we do declare the following to be a full, clear, and exact. dc-

. 'scription of our invention, such as will enable others skilled in the art to which it appertains to make and usethc same, reference being had to the accompanying drawing, and to the figures of reference marked thereon, which for-ma part of this specification.

()ur invention relates to improvements in building material and has for its object the provision of material of this character which may be effectively used as a reinforcement for concrete, columns and bars used for building purposes.

Another object of our invention resides in the provision of building material of this character shaped in such manner as to greatly increase the strength of the same.

Another object of our invention resides in the shaping of a reinforcing bar in such a manner as to obtain the greatest possible degree of strength without increasing the relative size of the bar.

Another object of our invention resides in the provision of an article of manufacture embodying certain features of construction whereby the strength of the article is greatly increased.

Our invention consists, inbrief, of a metal bar stamped in such a manner as to form alternately arranged concave and convex portions on opposite sides of the bar throughout the length of the latter. By virtue of this construction the bar is rendered much"stronger than the ordinary flat or smooth surfaced bar. tively carry out the increasing of the strength of the bar the convex surface of each convex section of the bar on each side of the bar gradually taper oil into the concavity of the adjacent convex sections of the bar.

Having set forth the objects of our invention and described the same in brief we will now proceed to describe the same in detail, reference being bad to the accompanying drawing, in which is illustrated an embodiment thereof.

In the drawing: Figure 1 is a top plan view of our improved reinforcing bar. Fig.

In order to ell'cc-.

2 is a side view of our improved reinforcing bar. Fig. 3 is a longitudinal section taken on the line 3-4), Fig. 1. Fig. 4 is a cross section taken on the line 4-4. l ig. i. Fig. 5 is a top plan view of a slightly modified form of our improved reinforcing bar. Fig. ti-is a longitudinal section of the modified form of our improved reinforcing bar, taken on the line 6-6, Fig. 1. Fig. 7 is a cross section of the modified form of our improved reinforcing bar taken on the line 7---7, Fig.

The same reference characters indicate the same parts in all views.

Let the numeral 5 designate our improved reinforcing bar in its entirety, the numeral (3 a concave section of the bar and the numeral 7 a convex section of the bar. Each extremity of the convex sections on opposite sides of the bar taper gradually into the concavity of the adjacent concave section 6 as shown at 8, whereby in orderto break the bar at the point of juncture of the different sections the same would have to be broken on lines extended at angles to each other as shown at 9 or else in a st aight line directly across the convex surface of one of the sections. It may be readily seen that it would be dillicult to break the bar on lines extended at angles to each other and that it would be equally as ditlicult to break the bar on a line transversely of one of the convex sections, therefore the strength of the reinforcing bar is largely increased when constructed in accordance with our invention.

Our improved reinforcing bar is formed from an ordinary straight and flat metal bar, alternately.arranged convex and concave portions being formed on each side preferably by a die and stamp, however, any other suitable machinery may be used for forming the alternately arranged convex and concave portions. The opposite side of each convex section 6 is of concave shape and similarly the opposite side of each convex section 7 is of concave shape. lVhile .we have referred to certain sections as concave and others as convex, it must be understood that. when the bar is reversed to view the same from the opposite side the sections which have been described as concave and convex, are respectively convex and concave, when the bar is reversed to view the same from the opposite side.

The form of our invention illustrated from Figs. 5 to inclusive, is substantially the same construction as the form heretotore described. However certain specific differences exist which we will novv proceed to describe. These diti'erences reside principally in the fori'uing of additional angles in the different sections ot the reinforcing bar. Each of the sections of a bar are provided with sides 10 11, 12 and 13 forming angles with each other and hv virtue of which the strength of the bar is increased to a greater extent. The method of forming he alternately arranged concave and con vex sections on opposite sides of the oar is substantially the same as that described in connection with the first described term olf my invention and need not he described here in rc'leiwnce to the present f rm of the invention. The convex surface of each section n'rerg'es into the concavity of the djacent. sections in the same manner as described in vievv'of; the first described form of my invention and for this 'eason not considered necessary to go into detail. of the same in connection of the presentv form. of the invention. Inother words the inodilied form of our invention substantially the same in all respects with the exception of the additional sides with which the sections are provided as described ahove.

Our improved building material may he used for various purposes, but its most common use is for the reinforcement of con-,

of bar having on opposite sides thereof in longitudinal alineinent throughout the length of the bar alternately arrangml convex and concave sections, the Cl'llIYtX surface of each section at its extremities gradually merging into the concavit of the adjacent sections and terminating on lines extending at angles to each other.

2. An article of manufacture consisting of bar having on opposite sides thereof in longitudinal alinement alternately arranged concave and convex sections the extremities of each conave section lacing closed hy he extremities of the adjacent convex sections 2*. A reinforcing har consisting oi alt rna'tely arranged concave and convex sections on opposite sides of the bar, the said con.- cave and, convex sections lacing arranged end to end throughout the length of the bar, the con ave and convex sect-ions oi. one side of the bar bein respectively convex and con cave on the opposite sideot the bar, the convex sections of one side of the bar closing the extremities of the adjacent concave sections of the same side of the bar, substantially as described.

4. A liniilding' and construction material. consisting of a metallic oar having" on oppo site sides thereof in longitudinal alinement alternately arranged convex and concave sectimis the convex surface of each section merging into the concavity of the adjacent sections, theeritremities of each convex section iJtillg tapered from the opposite edges of the section into the said concave secti ns, substantially as described.

In testimony whereof we atlix our signatures in the presence of two witnesses.

iii-URL E. BECKER. JOHN L. IQJAPP.

i-Vitnesses OLGA Enemy, lfinnix Eli-tins. 

